Achieving Near-Unity CO Selectivity for CO2 Electroreduction on an Iron-Decorated Carbon Material

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DOI

  • Xin Ming Hu, Carbon Dioxide Activation Center
  • ,
  • Daniela Mendoza, Laboratoire d'Electrochimie Moléculaire(LEM), Nanoscopium Synchrotron SOLEIL Saint-Aubin
  • ,
  • Monica Rohde Madsen
  • Dorian Joulié, Laboratoire d'Electrochimie Moléculaire(LEM)
  • ,
  • Benedikt Lassalle-Kaiser, Nanoscopium Synchrotron SOLEIL Saint-Aubin
  • ,
  • Marc Robert, Laboratoire d'Electrochimie Moléculaire(LEM), Institut Universitaire de France
  • ,
  • Steen U. Pedersen
  • Troels Skrydstrup
  • Kim Daasbjerg

A straightforward procedure has been developed to prepare a porous carbon material decorated with iron by direct pyrolysis of a mixture of a porous polymer and iron chloride. Characterization of the material with X-ray diffraction, X-ray absorption spectroscopy, and electron microscopy indicates the presence of iron carbide nanoparticles encapsulated inside the carbon matrix, and elemental mapping and cyanide poisoning experiments demonstrate the presence of atomic Fe centers, albeit in trace amounts, which are active sites for electrochemical CO2 reduction. The encapsulated iron carbide nanoparticles are found to boost the catalytic activity of atomic Fe sites in the outer carbon layers, rendering the material highly active and selective for CO2 reduction, although these atomic Fe sites are only present in trace amounts. The target material exhibits near-unity selectivity (98 %) for CO2-to-CO conversion at a small overpotential (410 mV) in water. Furthermore, the material holds potential for practical application, as a current density over 30 mA cm−2 and a selectivity of 93 % can be achieved in a flow cell.

OriginalsprogEngelsk
TidsskriftChemSusChem
Vol/bind13
Nummer23
Sider (fra-til)6360-6369
ISSN1864-5631
DOI
StatusUdgivet - dec. 2020

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